Here's a photo of my toadstool, he's had these red/white patches near the base of the stalk for as long as I can remember. The upper half looks pretty normal and he still opens up fully.
I'm a bit suspicious of what looks like it aiptasia just behind it. I'd need to get in a bit closer and move some rocks to see it properly, is it worth looking into?
Edited by ck1, 11 April 2012 - 04:08 AM.